Difference between 10.7 for iMac & 10.7 for Macbook Pro?!?!

I have just set up a new D-Link 655 router for myself (I Mac) and my wife's new Mac-book Pro. (It uses WPA a more secure version than previous D-Link router.)
We are both running the latest version of Lion 10.7.2
When I start my computer I am automatically connected to my network; when she starts her laptop she is asked to choose her network of those available???
With the previous D-Link router she was automatically connected like me (Security was a WEP key.
D-Link say this is a feature of the laptop? Is it?

Open System Preferences and then Network. Click on WiFi. Click on Advanced. What networks are listed there? your new router should be the first one in the list. Also if you are not ever going to use the old router, delete that entry from that list also.

it shouldnt be any different. Has she saved the password when she accesses the router?

She doesn't touch it so all faults are mine-smile. Yes your right about making sure MY network is first, I had removed the old one from her laptop but just noticed I haven't done the same with mine. I'll try it and see if it works-thanks for feedback, it all helps

Didn't change anything she is still prompted to choose a network-the others are neighbors not mine.
BTW whats the difference between WI-Fi and Airport? whenever I loose my service I find it has gone back to Airport instead of WI-Fi
I always thought Airport was a connection like the old "Peer" connection between two Macs?

Open System Preferences and then Network. Click on WiFi. Click on Advanced. What networks are listed there? your new router should be the first one in the list. Also if you are not ever going to use the old router, delete that entry from that list also.

Sometimes it must be almost impossible to answer peoples questions because you don't know some of the dumb things we do-GRIN

Believe it or not the aforesaid problem was caused by me using the default Network name of "dlink".

I have changed it and now problem solved. (Finally found some sound Apple advice to not use the default)

PS How do you add to peoples reputation? The only hyperlink was your name.

There are some small avatars at the bottom of a message on the left hand side of the screen. One looks like a pair of balances. If you click that you can add to a users reputation. There is a Triangle with an ! in it which is for reporting posts that are against forum rules.